TOPP ACK5/MAC4 Chain Actuators

The TOPP ACK5 is the UK's most popular chain window actuator, used across commercial, educational, and residential buildings wherever automated window opening is required. The ACK5 replaces the earlier ACK4 and is available in both 24V DC and 230V AC versions, making it compatible with the full range of MAC4 control units, rain sensors, thermostats, and building management systems.

The actuator uses a double-link, centrally-exiting articulated stainless steel chain enclosed in a die-cast aluminium body. The stainless steel chain construction ensures long-term corrosion resistance, making the ACK5 suitable for use in humid or coastal environments as well as standard commercial installations. Fixed and swivel bracket options are available to suit top-hung, bottom-hung, and side-hung window configurations.

Key Features

• Available in 24V DC or 230V AC — select the correct voltage when ordering
• Seven-position stroke adjustment dial on both sides of the unit
• Double-insulated electronics for safety compliance
• Built-in buzzer indicates incorrect installation or obstruction
• Synchronisation option available for operating multiple actuators simultaneously
• CE marked
• Available in White, Silver, and Black finishes

Technical Specification

• Push force: 300N (ACK5) / 200N (MAC4)
• Chain stroke: 200mm–500mm (model dependent)
• Operating temperature: -20°C to +70°C
• Protection class: IP 44
• Body material: Die-cast aluminium
• Chain material: Stainless steel

Important Notes

Not suitable for smoke ventilation or fire-rated applications. If you require actuators for smoke control or AOV (Automatic Opening Vent) systems, please contact us before ordering — smoke ventilation requires EN12101-2 certified products which are specified and supplied separately.

Brackets are sold separately. Click here to view compatible brackets.

Download the TOPP ACK5/MAC4 Data Sheet (PDF)